PARAGUTTA, A NEW INSULATING MATERIAL 



139 



found to be somewhat superior to ordinary vulcanized crude rubber 

 as regards its electrical stability in water. 



In addition to the superior electrical stability of deproteinized rubber, 

 it was found to be more readily plasticized and mixed with gutta 



H 1.5 



5 1.0 



2 3 



TIME IN WEEKS 



Fig. 1 — Effect of washing and removal of protein on the water absorption of crude 

 rubber when immersed in 3.5 per cent NaCl solution at room temperature. 



(? 35 



t 25 



2 3 



TIME IN WEEKS 



Fig. 2 — Effect of washing and removal of protein on the dielectric constant of crude 

 rubber when immersed in 3.5 per cent NaCl solution at room temperature. 



than is the case with crude rubber, thereby yielding a product with 

 better thermoplastic properties. 



